Rb-Sr and K-Ar Characteristics of Upper Vendian Clayey Rocks in the Russian Platform

The paper considers geochemical behavior of Rb-Sr and K-Ar systems in Upper Vendian clayey rocks of the Russian Platform. The use of additional material on size fractions of sediments recovered from boreholes drilled in the Gavrilov Yam area made it possible to confirm the previous inference on two stages of the epigenetic matter transformation (approximately 600 and 400 Ma ago). Distortions are related to transformation of sediments due to interaction in the water-rock system. The degree of interaction was more intense in the upper part of the sedimentary section relative to its lower strata. These inferences are substantiated by materials from boreholes that characterize different types of Vendian sections and different tectonic zones.